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Q1:
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What would be the equivalent z-score for a confidence level of 96%? |
A. 1.844
B. 0.1844
C. 2.054
D. 2.05
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Answer 1: |
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Q2:
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A sample of size 80 is taken from a population C with a mean of 55 and a standard deviation of 5.2.
A sample of size 70 is taken from a population D with a mean of 51 and a standard deviation of 4.9.
Find the standard deviation of ( -  )
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A. 0.367
B. 0.135
C. 0.825
D. 0.681
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Answer 2: |
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Q3:
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Find a 95% confidence interval for the difference of the means of populations C and D. |
A. (2.38, 5,62)
B. (4.83, 3.17)
C. (2.64, 5.36)
D. (2.48, 5,52)
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Answer 3: |
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Q4:
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Is there sufficient evidence to suggest that the means of populations C and D are different? |
A. Yes
B. No
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Answer 4: |
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Q5:
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A random sample of 100 oranges from the South Island has oranges with a mean weight of 240 g and a standard deviation of 40 g, whereas a sample of 100 oranges from the North Island has a mean weight of 210 g and a standard deviation of 30 g .
The samples are independent and normally distributed.
Construct a 90% confidence interval for the difference between the mean weights of the oranges in the two locations.
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A. (-11.1, 71.1)
B. (21.8, 38.2)
C. (22.3, 36.7)
D. (20.2, 39.8)
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Answer 5: |
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